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Irrational Ideas: the speculative and the disproven. From 30 Philosophers (updated): Irrational ideas, by definition, are considered irrationally false in a classical logical setting. These ideas are either inconsistent or rely on unverified empirical claims. Some can be proven false, while others remain untestable. There are two levels of falsehood: disproven ideas are always irrationally false, while speculative ideas are irrationally false only in a binary logical setting; otherwise, they are simply irrational. For example, beyond that strict logical setting, astrology remains irrationally false because it has been empirically disproven, while unicorns remain merely irrational because you cannot prove they do not exist.
The Ideas Timeline: Irrational

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